Attempting to have more control over placement of title and buttons in a UINavigationItem

ViewController.swift

class ViewController: UINavigationController {

	override func viewDidLoad() {
		super.viewDidLoad()
		
		// This seems like a really bad idea...
		self.children.first?.navigationItem.titleView = navItemReplacementVIew()
	}
	
	func navItemReplacementVIew() -> UIView {
		let view 		= UIView()
		let titleLabel 		= UILabel()
		let actionButton 	= UIButton()
		
		view.widthAnchor.constraint(equalToConstant: 500).isActive = true
		
		titleLabel.text = "Hello world"
		actionButton.setTitle("Done", for: .normal)
		actionButton.setTitleColor(.blue, for: .normal)
		
		titleLabel.translatesAutoresizingMaskIntoConstraints 	= false
		actionButton.translatesAutoresizingMaskIntoConstraints	= false
		
		view.addSubview(titleLabel)
		view.addSubview(actionButton)
		
		NSLayoutConstraint.activate([
			titleLabel.topAnchor.constraint(equalTo: 	view.topAnchor, constant: 8),
			titleLabel.leadingAnchor.constraint(equalTo: 	view.leadingAnchor, constant: 8),
			titleLabel.trailingAnchor.constraint(equalTo: 	actionButton.leadingAnchor, constant: 8),
			titleLabel.bottomAnchor.constraint(equalTo: 	view.bottomAnchor, constant: -8),
			
			actionButton.topAnchor.constraint(equalTo: 	view.topAnchor, constant: 8),
			actionButton.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -8),
			actionButton.bottomAnchor.constraint(equalTo: 	view.bottomAnchor, constant: -8)
		])
		
		return view
	}
}

Here's what it looks like in the simulator: